How can I use tracks for compiling a new trip?

This is why I can't stand Garmin products.  This is the bridge that Basecamp says I can't take my touring bike across:  43.27962730039652, -79.89101671312548

It has bike lanes.  My map is from 2019.  

Which map are you using in BaseCamp? It can only calculate routes if they exist as routeable on the map you're using. If it won't route across that bridge it is the maps fault, not BaseCamp.

I do a lot of walking and to create routes to go where I want I use the direct activity setting in BaseCamp.

City Navigator North America NT 2019.3

How would a bridge that's been there for 150 years with a road on it, not be routeable by a bicycle?  That map is still Garmin's product.  

Even using Direct, it's snapping to known routes.  I can't make routes.  I'll have to make a fake track.  

Where is this bridge, I'll have a look to see what the issue is.

It's in the first post.  

Ah yes, just seen he included the location in his first post 

What do you mean by trace my tracks?  I have other people's tracks, not mine.  Taking tracks and waypoints, and creating routes, completely disfigures it, as with other examples I've found as well after this issue.  

Import the tracks into BC, then use the routing tool to click at intervals along the track. You will get a feel for how far you can "stretch" the interval between clicks without it choosing the wrong route and of course you can then go back and fix those glitches later once you finish drawing the route.